feat: add vue-i18n skills

[loicduong]

Clear and concise description of the problem

To better support AI, it's time for an official skill for vue-i18n.

### Suggested solution

Alternative

No response

Additional context

### Validations

- [x] Read the [Contributing Guidelines](https://github.com/intlify/vue-i18n/blob/master/.github/CONTRIBUTING.md)
- [x] Read the [Documentation](https://vue-i18n.intlify.dev/)
- [x] Check that there isn't already an issue that request the same feature to avoid creating a duplicate.